Create GameService

[MaxMorrisMN]

findAllGames() : List findGameByCode(String gameCode) : Game findGameUser(String gameCode, int userId) : GameUser findByGameCode(String gameCode) : List createGame() : Result createGameQuestion(String gameCode, String category) : Result createGameUser(String gameCode, int userId) : Result updateGameUser(int userId, String gameCode, int numAnswered, int numCorrect) : Result gameCodeGenerator() : String